2097352- BPC 7.5 Server Diagnostic - error could not load file or assembly 'AnitXSSlibrary' or one of its dependencies

Symptom

An upgrade of BPC system to BPC 7.5 Support pack 17and the associated ABAP system to CPMBPC 750 SP 17.

An error in the SAP Server Manager as well as an error when trying to connect to http://localhost/osoft/ : could not load file or assembly 'AnitXSSlibrary' or one of its dependencies. This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded.